This is kind of a reply to my own question. There seems to be questions about the Flex alpha and pen support. I also saw reviews etc that mentioned S Pen support. My test was to take the S Pen out of my wife's Chromebook and try to use it.  NOTHING. I then decided to try the pen that I bought to replace the original pen that came with my Surface Pro 4. What I have is a Surface Pen by Pac Dot that I got on Amazon for about  $37. It uses one of those AAAA batteries that you have to dig to find. It has a rocker button on the side but no button on the end like the original pen had. I found that it worked fine with the Surface. When I hold it near the Flex alpha screen a cursor appears. If I hold down the side button and swipe text, it is selected. If I hold down the side button and touch the screen, the right-click menu appears. If I open a Photoshop editor, it can be used for brushes and selections. If I open the Samsung Notes app, the pen works. It has palm rejection. I downloaded the very nice Bamboo Paper app and it works. If I open the Live Message app, the pen works and the pen is pressure sensitive, more pressure gives wider lines. I don't get the semicircle of choices like I got with the S Pen on my Note 10.  There are probably other things that this pen cannot do, and i anyone would like to ask me to try something, I will be happy to do it. When I bought the Flex alpha, I did not think it had pen support but certainly expected to try based on the information in some reviews, AND the section on the S Pen that is in the tiny included "User Manual" Much of the pen support is probably coming from Windows 10. There are some simple settings for the pen in Windows Settings Devices. Frankly, considering that I was not planning on pen support, I am very pleased with how useful the pen is and I am glad that I happened to have the active pen from my Surface Pro around so that I found out that it worked. Everything else about the Flex alpha is great, except that the speakers could be louder. ... View more